The I-5 to Medina: Bridge Replacement and HOV Project will replace the interchanges and roadway between I-5 in Seattle and the eastern end of the floating bridge.

Why is WSDOT
pursuing this project?

Approximately 70,000 vehicles cross Lake Washington every day on the SR 520 floating bridge. It’s a key regional route for commuters and freight.

After floating for more than 50 years, the four-lane bridge is often clogged by traffic and is showing its age.

The floating bridge pontoons are vulnerable to windstorms, and bridge support columns are vulnerable to earthquakes.

The End Result

The I-5 to Medina Bridge Replacement and HOV Project includes a new floating bridge and highway with six lanes, including two general-purpose lanes and one new transit/HOV lane in each direction.

The project also takes key steps to get ready for future light rail, help manage traffic in the Arboretum and transform the future corridor from Montlake to I-5 into a city parkway with landscaped lids and medians.

Project Benefits

The new SR 520 corridor through Seattle will:

Provide transit connections and priority.

Create a pedestrian-friendly urban interchange at Montlake Boulevard.

Restore park area and connections next to the Washington Park Arboretum.

Reduce noise levels from the Portage Bay Bridge.

Be ready for light rail if the region chooses to fund it in the future.